From Pool and Spa News:

How confident are you in the accuracy of your water tests?

An overdose of chlorine or bromine can produce readings that are at times wildly off the charts. Such errors not only foul up sanitation tests, but also make it difficult to gauge levels of pH and total alkalinity — and they affect both the drop-test and color-matching methods.

Of course, excessively high sanitation isn’t the only culprit. Many other things can interfere with test results.

Because too much chlorine or bromine is the most common cause of inaccurate results, we’re going to first look at how to adjust your water samples to account for those discrepancies. Then we’ll examine some of the other factors that corrupt water tests.

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